e/Synovial sac

Information
has gloss	eng: The synovial sac is one of the seven parts of a joint located in the body, along with muscle, tendon, ligament, bone, articular cartilage and bursa. The synovial sac is a thin tissue that lines the joint. It is filled with a fluid that works like oil in a car, lubricating the joint and making it move easily. If this sac is ruptured or destroyed from continuous use or being overweight over a long period of time, it may cause the bones to become stiff and can cause arthritis.
lexicalization	eng: synovial sac
instance of	(noun) (anatomy) the point of connection between two bones or elements of a skeleton (especially if it allows motion) articulatio, articulation, joint